Graph/ Charting Tool for RoR


I'm evaluating some charting tools (free) to be used with RoR web application. Those should be easy to use and yet have some elegant features. At the moment I'm using Open Flash chart. But I'm on evaluating following 2.

- FusionCharts Free - JavaScript charts for web & mobile | FusionCharts

- ZiYa -

I guess FusionCharts will be an excellent tool. But no idea about ZiYa yet.

Would like to share your experience and comments.



Gruff Graph is awesome,